I'm thinking about getting a 15" MBP retina, but at around double the price of the 13 retina, I'm wondering if I can get away with the latter. I had a 27" 2010 iMac (3.06 GHz, 12GB, some ATI graphics) and I had three major issues with Premiere on it. The scrubbing was super slow, to the point that it was hard to select clips from the raw material. This with the previews at the lowest possible resolution. Second problem was that applying effects like warp stabilizer would take an eternity; even on a 15-second clip, I'd need to go do something else for a while (20 minutes?). Third problem was export times. 7-10 minute clips (warp stabilizer on some clips is all I had) took me 8-30+ hours to export. So I dumped that machine and built a Windows PC/hackintosh. 2600K, 32GB RAM, GTX 580 3GB graphics) and found that that scrubbing was fast and easy, warp stabilizer took maybe a minute on similar 10-20 second clips to apply and export times were 2-5 minutes for videos 4-10 minutes in length. I actually got two GTX 580s but found that Premiere doesn't take advantage of multiple GPUs, so I got rid of one. I found a page somewhere comparing export times on Premiere with different GPUs, and it seems to suggest that performance in Premiere is heavily dependent on GPU... namely amount of RAM and CUDA cores. My 580 beats a LOT of cards out there surprisingly. So considering that, I was thinking that a 750M-packing 15" rMBP was a necessity, but I see everywhere that people do in fact edit on 13" rMBPs... just wondering how the experience is? Perhaps some existing users could chime in? Is scrubbing raw material smooth enough, any issues with that? How long does it take to apply warp stabilizer to a 10-second clip? What are export times like?